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    <title>ShellCheck: SC1065 – Trying to declare parameters? Don't. Use `()` and refer to params as `$1`, `$2`, ..</title>
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    <h1>SC1065 – ShellCheck Wiki</h1>
    <a href="https://github.com/koalaman/shellcheck/wiki/SC1065">See this page on GitHub</a>
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    <h2
id="trying-to-declare-parameters-dont-use--and-refer-to-params-as-1-2-">Trying
to declare parameters? Don't. Use <code>()</code> and refer to params as
<code>$1</code>, <code>$2</code>, ..</h2>
<h3 id="problematic-code">Problematic code:</h3>
<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="SC1065.html#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="ex">foo</span><span class="er">(</span><span class="ex">input</span><span class="kw">)</span> <span class="kw">{</span></span>
<span id="cb1-2"><a href="SC1065.html#cb1-2" aria-hidden="true" tabindex="-1"></a>  <span class="bu">echo</span> <span class="st">&quot;</span><span class="va">$input</span><span class="st">&quot;</span></span>
<span id="cb1-3"><a href="SC1065.html#cb1-3" aria-hidden="true" tabindex="-1"></a><span class="kw">}</span></span>
<span id="cb1-4"><a href="SC1065.html#cb1-4" aria-hidden="true" tabindex="-1"></a><span class="ex">foo</span><span class="er">(</span><span class="st">&quot;hello world&quot;</span><span class="kw">);</span></span></code></pre></div>
<h3 id="correct-code">Correct code:</h3>
<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="SC1065.html#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="fu">foo()</span> <span class="kw">{</span></span>
<span id="cb2-2"><a href="SC1065.html#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="bu">echo</span> <span class="st">&quot;</span><span class="va">$1</span><span class="st">&quot;</span></span>
<span id="cb2-3"><a href="SC1065.html#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="kw">}</span></span>
<span id="cb2-4"><a href="SC1065.html#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="ex">foo</span> <span class="st">&quot;hello world&quot;</span></span></code></pre></div>
<h3 id="rationale">Rationale:</h3>
<p>Shell script functions behave just like scripts and other
commands:</p>
<ul>
<li>They always take a 0 to N parameters, referred to with
<code>$1</code>, <code>$2</code> etc. They can not declare parameters by
name.</li>
<li>They are executed using <code>name arg1 arg2</code>, and not with
parentheses as C-like languages.</li>
</ul>
<h3 id="exceptions">Exceptions:</h3>
<p>None.</p>
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    <p style='font-size: 80%'><a href="../index.html">ShellCheck</a> is a static analysis tool for shell scripts. This page is part of its documentation.</p>
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